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. 1983 Nov;42(2):796–801. doi: 10.1128/iai.42.2.796-801.1983

Cutaneous inflammatory reactions to group A streptococcal cell wall fragments in Fisher and Lewis inbred rats.

J B Allen, G B Calandra, R L Wilder
PMCID: PMC264500  PMID: 6358033

Abstract

Systemic administration of an aqueous suspension of group A streptococcal cell wall fragments induces severe, chronic erosive polyarthritis in LEW/N female rats, but rarely in F344/N female rats. In the present study, we attempted to exclude unresponsiveness to the cell walls as a mechanism for arthritis resistance in F344/N females. Cutaneous inflammatory reactions were assessed in both strains at various time points after direct injection of cell wall fragments of three different average molecular weights. Fragments of all sizes induced an acute inflammatory reaction, with infiltration of polymorphonuclear leukocytes and a few mononuclear cells. Small fragments (approximately 5 megadaltons) induced a transient response which resolved by day 14. Large fragments (approximately 500 megadaltons) induced severe inflammation characterized by prominent mononuclear leukocyte infiltration, whereas the intermediate-sized fragments (approximately 50 megadaltons) induced inflammation of intermediate intensity and duration. The intensity and severity of the lesions paralleled the persistence of cell wall antigens at the site of deposition. F344/N female rats responded acutely to the cell walls, with an intensity equal to or greater than that of LEW/N female rats, but the lesions tended to resolve more rapidly. These findings indicate that severity and chronicity of streptococcal cell wall-induced inflammation are dependent on the size of the fragment and provide evidence that arthritis resistance in F344/N female rats does not result from a completely unresponsive state to the proinflammatory effects of the cell walls.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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